pig unable to find the jar file. are you added any new jar’s. plaese find the jar file in your system and copy to the /usr/lib/hive/lib as follows. switch to root user then
# find / -name slf4j-api-*.jar
cp <source location> /usr/lib/hive/lib/
...

pig unable to find the jar file. are you added any new jar’s. plaese find the jar file in your system and copy to the /usr/lib/hive/lib as follows. switch to root user then
# find / -name slf4j-api-*.jar
cp <source location> /usr/lib/hive/lib/